US5856223A - Method for manufacturing self-aligned split-gate flash memory cells - Google Patents
Method for manufacturing self-aligned split-gate flash memory cells Download PDFInfo
- Publication number
- US5856223A US5856223A US08/859,968 US85996897A US5856223A US 5856223 A US5856223 A US 5856223A US 85996897 A US85996897 A US 85996897A US 5856223 A US5856223 A US 5856223A
- Authority
- US
- United States
- Prior art keywords
- flash memory
- memory cells
- layer
- gate flash
- manufacturing self
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/30—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region
Definitions
- the invention relates to a memory cell process and, in particular, to a method for manufacturing split-gate flash memory cells.
- EEPROM electrically erasable programmable read-only memories
- the length of the selection gate 22 must be increased, thereby consuming a larger amount of space on the substrate and preventing a drain 24 and source 26 from being formed using separate and different implantations selected on the basis of desired and possibly different characteristics.
- the object of the invention is to provide a method for manufacturing self-aligned split-gate flash memory cells wherein the split-gate structure is formed by a self-aligned approach, so that the length of a channel can be precisely controlled. Furthermore, sources and drains are formed separately by executing different implantations, so that the dopant parameters of the sources and drains can be changed, based on desired and possibly different characteristics.
- FIG. 1A is a cross-sectional view illustrating a flash EEPROM cell manufactured according to the prior art
- FIG. 1B is a perspective view illustrating a flash EEPROM cell manufactured according to the prior art
- FIG. 2 is a cross-sectional view illustrating another flash EEPROM cell manufactured according to the prior art.
- FIG. 3a-3m are cross-sectional views illustrating a method for manufacturing a self-aligned split-gate flash memory cell according to an embodiment of the invention.
- a method for manufacturing a self-aligned split-gate flash memory cell is illustrated as follows.
- a tunneling oxide layer 32 having a thickness of 90 ⁇ is formed on a substrate 30 (FIG. 3a).
- a first poly-silicon layer 34 having a thickness of 1,000 ⁇ is deposited on tunneling oxide layer 32 (FIG. 3b).
- a first thermal oxide layer 36 having a thickness of 60 ⁇ is deposited on first poly-silicon layer 34 and a first nitride layer 38 having a thickness of 150 ⁇ is thereafter deposited on first thermal oxide layer 36 (FIG. 3c).
- a second thermal oxide layer 40 having a thickness in a range between 60 ⁇ and 100 ⁇ is deposited on first nitride layer 38 which together with second thermal oxide layer 40 and first oxide layer 36 forms an oxide-nitride-oxide (ONO) structure (FIG. 3d).
- a second poly-silicon layer 42 having a thickness of 1,500 ⁇ is deposited on second thermal oxide layer 40; a TEOS layer 44 having a thickness of 1000 ⁇ A on second poly-silicon layer 42; followed by an additional nitride layer 46 having a thickness of 400 ⁇ on TEOS layer 44 (FIG. 3e).
- Two gates 47 each of which includes a control gate and a floating gate are formed by a self-aligned etching process (FIG. 3f).
- a third thermal oxide layer 48 having a thickness of 60 ⁇ is deposited over the two gates and the exposed surfaces of substrate 30, and a second nitride layer 50 having a thickness of 200 ⁇ is then deposited over third thermal oxide layer 48 (FIG. 3g).
- a back-etch is executed in order to form nitride spacers 51 from second nitride layer 50.
- An oxide layer 52--for example, a TEOS layer--having a thickness in a range between 5,000 ⁇ and 6,000 ⁇ is then deposited over spacers 51, the two gates and exposed surfaces of substrate 30 (FIG. 3h).
- a back-etch is executed in order to form oxide spacers 53 from oxide layer 52 to cover spacers 51 and portions of substrate 30 (FIG. 3i).
- a photoresist 55 is formed over substrate 30 and the gates except between transistors 100 and 101; a drain 56 is then formed by implantation with a dopant, such as arsenic atoms having an energy level of 50 KeV and a concentration of 7E15/cm 3 (FIG. 3l).
- Photoresist 55 is removed and a fourth thermal oxide, a third poly-silicon layer 60, and a tungsten silicon (WSi) layer 62, having a thickness of 220 ⁇ , 1,500 ⁇ , and a 1,200 ⁇ , respectively are deposited over the gates and substrate 30 (FIG. 3m).
- a word line (not shown) is then defined by etching to third poly-silicon layer 60.
- floating gate regions may be defined by etching and then by implanting the floating gate regions with a dopant, such as arsenic atoms having a concentration in a range between about 5E15/cm3 and about 7E15/cm 3 and an energy level in a range between about 30 KeV and about 50 KeV after step 3, i.e., after depositing first thermal oxide layer 36 and first nitride layer 38.
- a dopant such as arsenic atoms having a concentration in a range between about 5E15/cm3 and about 7E15/cm 3 and an energy level in a range between about 30 KeV and about 50 KeV after step 3, i.e., after depositing first thermal oxide layer 36 and first nitride layer 38.
Landscapes
- Non-Volatile Memory (AREA)
Abstract
A method for manufacturing self-aligned split-gate flash memory cells wherein the split-gate structure is formed by a self-aligned approach, so that the length of a channel can be precisely controlled. Furthermore, sources and drains are formed separately by executing different implantations, so that the dopant parameters of the sources and drains can be changed, based on desired and possibly different characteristics.
Description
1. Field of the Invention
The invention relates to a memory cell process and, in particular, to a method for manufacturing split-gate flash memory cells.
2. Description of the Prior Art
A method for manufacturing electrically erasable programmable read-only memories (EEPROM) is disclosed by Naruke et al. in "A New Flash-Erase EEPROM Cell with a Sidewall Select-Gate on its Source Side" (Technical Digest of IEEE Electron Device Meeting in 1988). Referring to FIGS. 1A and 1B, a first poly-silicon layer and a second poly-silicon layer are formed as a floating gate 10 and a control gate 12, respectively. Next, a third poly-silicon layer is deposited; then, an etch-back technique is utilized to form a selection gate 14 wherein the height of the selection gate 14, defined by the height of the floating gate 10 and control gate 12, is about 0.4 μm. In addition, since etch-back is used in the above process, the selection gate 14 must be parallel to the control gate 12.
The disadvantages of the above-mentioned conventional process are that the selection gate and control gate which are parallel with each other take up too much space and the length of the selection gate is fixed, so that the characteristics of the memory can not be effectively adjusted. Solutions for overcoming these disadvantages are described in "A novel high density contactless flash memory array using split-gate source-side injection cell for 5V-only application" by Y. Ma at a symposium on VLSI Technology in 1994. As shown in FIG. 2, a high-density memory array and high access efficiency can be obtained by forming a parallel selection gate 22. However, due to limitations in the precision of the photolithography used to form the above-mentioned split-gate structure, the length of the selection gate 22 must be increased, thereby consuming a larger amount of space on the substrate and preventing a drain 24 and source 26 from being formed using separate and different implantations selected on the basis of desired and possibly different characteristics.
Accordingly, the object of the invention is to provide a method for manufacturing self-aligned split-gate flash memory cells wherein the split-gate structure is formed by a self-aligned approach, so that the length of a channel can be precisely controlled. Furthermore, sources and drains are formed separately by executing different implantations, so that the dopant parameters of the sources and drains can be changed, based on desired and possibly different characteristics.
The objects, characteristics, and advantages of the present invention will be explained using a preferred embodiment with pertinent drawings as follows:
FIG. 1A is a cross-sectional view illustrating a flash EEPROM cell manufactured according to the prior art;
FIG. 1B is a perspective view illustrating a flash EEPROM cell manufactured according to the prior art;
FIG. 2 is a cross-sectional view illustrating another flash EEPROM cell manufactured according to the prior art; and
FIG. 3a-3m are cross-sectional views illustrating a method for manufacturing a self-aligned split-gate flash memory cell according to an embodiment of the invention.
A method for manufacturing a self-aligned split-gate flash memory cell according to an embodiment of the invention is illustrated as follows. A tunneling oxide layer 32 having a thickness of 90 Å is formed on a substrate 30 (FIG. 3a). A first poly-silicon layer 34 having a thickness of 1,000 Å is deposited on tunneling oxide layer 32 (FIG. 3b). A first thermal oxide layer 36 having a thickness of 60 Å is deposited on first poly-silicon layer 34 and a first nitride layer 38 having a thickness of 150 Å is thereafter deposited on first thermal oxide layer 36 (FIG. 3c). A second thermal oxide layer 40 having a thickness in a range between 60 Å and 100 Å is deposited on first nitride layer 38 which together with second thermal oxide layer 40 and first oxide layer 36 forms an oxide-nitride-oxide (ONO) structure (FIG. 3d). A second poly-silicon layer 42 having a thickness of 1,500 Å is deposited on second thermal oxide layer 40; a TEOS layer 44 having a thickness of 1000 Å A on second poly-silicon layer 42; followed by an additional nitride layer 46 having a thickness of 400 Å on TEOS layer 44 (FIG. 3e). Two gates 47 each of which includes a control gate and a floating gate are formed by a self-aligned etching process (FIG. 3f). A third thermal oxide layer 48 having a thickness of 60 Å is deposited over the two gates and the exposed surfaces of substrate 30, and a second nitride layer 50 having a thickness of 200 Å is then deposited over third thermal oxide layer 48 (FIG. 3g). A back-etch is executed in order to form nitride spacers 51 from second nitride layer 50. An oxide layer 52--for example, a TEOS layer--having a thickness in a range between 5,000 Å and 6,000 Å is then deposited over spacers 51, the two gates and exposed surfaces of substrate 30 (FIG. 3h). A back-etch is executed in order to form oxide spacers 53 from oxide layer 52 to cover spacers 51 and portions of substrate 30 (FIG. 3i). Source regions 54aand 54bare formed by utilizing oxide spacers 53 as a mask and implanting a dopant, such as arsenic atoms having an energy level of 50 KeV and a concentration of 7E15/cm3 (FIG. 3j). Fluorhydric acid (HF) is used to remove oxide spacers 53 (FIG. 3k). By means of photolithography, a photoresist 55 is formed over substrate 30 and the gates except between transistors 100 and 101; a drain 56 is then formed by implantation with a dopant, such as arsenic atoms having an energy level of 50 KeV and a concentration of 7E15/cm3 (FIG. 3l). Photoresist 55 is removed and a fourth thermal oxide, a third poly-silicon layer 60, and a tungsten silicon (WSi) layer 62, having a thickness of 220 Å, 1,500 Å, and a 1,200 Å, respectively are deposited over the gates and substrate 30 (FIG. 3m). A word line (not shown) is then defined by etching to third poly-silicon layer 60.
Other embodiments are within the claims. For example, floating gate regions may be defined by etching and then by implanting the floating gate regions with a dopant, such as arsenic atoms having a concentration in a range between about 5E15/cm3 and about 7E15/cm3 and an energy level in a range between about 30 KeV and about 50 KeV after step 3, i.e., after depositing first thermal oxide layer 36 and first nitride layer 38.
Although the invention has been disclosed in terms of a preferred embodiment, the disclosure is not intended to limit the invention. Those knowledgeable in the art can make modifications within the scope and spirit of the invention which is determined by the claims below.
Claims (18)
1. A method for manufacturing self-aligned split-gate flash memory cells comprising:
providing a substrate and forming a tunneling oxide layer on said substrate;
depositing a first poly-silicon layer on said tunneling oxide layer;
depositing a first thermal oxide layer on the first poly-silicon layer and then depositing a first nitride layer on said first thermal oxide layer;
depositing a second thermal oxide layer over said first nitride layer;
depositing a second poly-silicon layer over the second thermal oxide layer and depositing a second dielectric structure over said second poly-silicon layer;
forming a plurality of gates using a self-aligned etching process;
depositing a third thermal oxide layer over the plurality of gates and the substrate, and depositing a second nitride layer over said third thermal oxide layer;
forming a plurality of nitride spacers by executing a back etch to said second nitride layer, and then depositing an oxide layer over the nitride spacers, the plurality of gates and the substrate;
forming a plurality of oxide spacers around and between the plurality of gates by executing a back etch to said oxide layer;
forming a plurality of sources by ion implantation by using said oxide spacers as a mask, and then removing said oxide spacers;
forming a photoresist over said substrate except for regions between the plurality of gates by photolithography and then executing implantation to form a plurality of drains;
removing said photoresist;
depositing a fourth thermal oxide layer over the plurality of gates and the substrate, depositing a third poly-silicon layer over said fourth thermal oxide layer, and depositing a metal silicide layer over said third poly-silicon layer; and
etching said third poly-silicon layer.
2. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 1 wherein said second dielectric structure is a TEOS layer.
3. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 2 wherein the thickness of said TEOS layer is about 1,000 Å.
4. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 1 wherein said metal silicide layer is a tungsten silicon (WSi) layer.
5. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 4 wherein the thickness of said tungsten silicon layer is about 1,200 Å.
6. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 1 wherein the thickness of said tunneling oxide layer is about 90 Å.
7. The method for manufacturing self-aligned split-gates flash memory cells as claimed in claim 1 wherein the thickness of said first poly-silicon layer is about 1,000 Å.
8. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 1 wherein the thickness of said first thermal oxide layer is about 60 Å.
9. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 1 wherein the thickness of said first nitride layer is about 150 Å.
10. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 1 wherein the thickness of said second thermal oxide layer is in a range between about 60 Å and about 100 Å.
11. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 1 wherein the thickness of said second poly-silicon layer is about 1,500 Å.
12. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 1 wherein the thickness of said second dielectric structure is about 1,000 Å.
13. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 1 wherein a dopant used in said implantation of forming said sources may be arsenic atoms having an energy level of about 50 KeV and a concentration of about 7E15/cm3.
14. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 1 wherein said oxide spacers are removed by using fluorhydric acid (HF).
15. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 1 wherein a dopant used in said implantation of forming said drains may be arsenic atoms having an energy level of about 50 KeV and a concentration of about 7E15/cm3.
16. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 1 wherein the thickness of said third thermal oxide layer is about 220 Å.
17. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 1 wherein the thickness of said third poly-silicon layer is about 1,500 Å.
18. The method for manufacturing self-aligned split-gate flash memory cells as claimed in claim 1 wherein the thickness of said second nitride layer is about 200 Å.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW086102305A TW340958B (en) | 1997-02-25 | 1997-02-25 | The producing method for self-aligned isolating gate flash memory unit |
TW86102305 | 1997-02-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
US5856223A true US5856223A (en) | 1999-01-05 |
Family
ID=21626415
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/859,968 Expired - Lifetime US5856223A (en) | 1997-02-25 | 1997-05-21 | Method for manufacturing self-aligned split-gate flash memory cells |
Country Status (2)
Country | Link |
---|---|
US (1) | US5856223A (en) |
TW (1) | TW340958B (en) |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6096603A (en) * | 1998-02-16 | 2000-08-01 | Worldwide Semiconductor Manufacturing Corp. | Method of fabricating a split gate structure of a flash memory |
US6143606A (en) * | 1997-12-26 | 2000-11-07 | Worldwide Semiconductor Manufacturing Corp | Method for manufacturing split-gate flash memory cell |
US6198144B1 (en) * | 1999-08-18 | 2001-03-06 | Micron Technology, Inc. | Passivation of sidewalls of a word line stack |
US6232179B1 (en) * | 1997-06-27 | 2001-05-15 | Matsushita Electronics Corporation | Semiconductor device and method of manufacturing the same |
US6255164B1 (en) * | 1999-08-03 | 2001-07-03 | Worldwide Semiconductor Manufacturing Corp. | EPROM cell structure and a method for forming the EPROM cell structure |
JP2001196479A (en) * | 1999-12-27 | 2001-07-19 | Hyundai Electronics Ind Co Ltd | Method for manufacturing flash memory element |
US20030071304A1 (en) * | 1999-08-13 | 2003-04-17 | Ogle Robert B. | Method of forming flash memory having pre-interpoly dielectric treatment layer |
US6710395B2 (en) * | 2001-12-19 | 2004-03-23 | Renesas Technology Corp. | Non-volatile semiconductor memory device with improved performance |
US20050045939A1 (en) * | 2003-08-27 | 2005-03-03 | Eungjoon Park | Split-gate memory cell, memory array incorporating same, and method of manufacture thereof |
US20050167728A1 (en) * | 2004-01-29 | 2005-08-04 | Chandrasekharan Kothandaraman | Single-poly 2-transistor based fuse element |
US20060141710A1 (en) * | 2004-12-27 | 2006-06-29 | Jae-Man Yoon | NOR-type flash memory device of twin bit cell structure and method of fabricating the same |
KR100607322B1 (en) * | 1999-06-30 | 2006-07-28 | 주식회사 하이닉스반도체 | Method of manufacturing a flash EEPROM cell |
US7130182B2 (en) * | 2003-05-27 | 2006-10-31 | Texas Instruments Incorporated | Stacked capacitor and method for fabricating same |
US20060252204A1 (en) * | 2005-05-03 | 2006-11-09 | Hynix Semiconductor Inc. | Method of manufacturing a flash memory device |
US20080067579A1 (en) * | 2006-09-18 | 2008-03-20 | Lee Joo-Hyeon | Flash memory device and method for manufacturing the same |
CN102916013A (en) * | 2011-08-04 | 2013-02-06 | 无锡华润上华半导体有限公司 | OTP (one time programmable) device and manufacturing method thereof |
US20130280874A1 (en) * | 2012-04-20 | 2013-10-24 | Ping-Chia Shih | Method of fabricating semiconductor device |
US8895397B1 (en) * | 2013-10-15 | 2014-11-25 | Globalfoundries Singapore Pte. Ltd. | Methods for forming thin film storage memory cells |
US20150372121A1 (en) * | 2014-06-19 | 2015-12-24 | Taiwan Semiconductor Manufacturing Co., Ltd. | Asymmetric formation approach for a floating gate of a split gate flash memory structure |
US11245026B2 (en) * | 2019-11-22 | 2022-02-08 | Winbond Electronics Corp. | Memory devices |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102064101B (en) * | 2009-11-18 | 2013-03-13 | 上海华虹Nec电子有限公司 | Method for restraining gate electrode injection by using P-type polysilicon electrode |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5364806A (en) * | 1991-08-29 | 1994-11-15 | Hyundai Electronics Industries Co., Ltd. | Method of making a self-aligned dual-bit split gate (DSG) flash EEPROM cell |
US5482879A (en) * | 1995-05-12 | 1996-01-09 | United Microelectronics Corporation | Process of fabricating split gate flash memory cell |
US5482881A (en) * | 1995-03-14 | 1996-01-09 | Advanced Micro Devices, Inc. | Method of making flash EEPROM memory with reduced column leakage current |
US5607871A (en) * | 1995-02-28 | 1997-03-04 | Hyundai Electronic Industries Co., Ltd. | Method of manufacturing a flash EEPROM cell using the select gates as a mask |
-
1997
- 1997-02-25 TW TW086102305A patent/TW340958B/en active
- 1997-05-21 US US08/859,968 patent/US5856223A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5364806A (en) * | 1991-08-29 | 1994-11-15 | Hyundai Electronics Industries Co., Ltd. | Method of making a self-aligned dual-bit split gate (DSG) flash EEPROM cell |
US5607871A (en) * | 1995-02-28 | 1997-03-04 | Hyundai Electronic Industries Co., Ltd. | Method of manufacturing a flash EEPROM cell using the select gates as a mask |
US5482881A (en) * | 1995-03-14 | 1996-01-09 | Advanced Micro Devices, Inc. | Method of making flash EEPROM memory with reduced column leakage current |
US5482879A (en) * | 1995-05-12 | 1996-01-09 | United Microelectronics Corporation | Process of fabricating split gate flash memory cell |
Non-Patent Citations (4)
Title |
---|
Ma., et al., "A Novel High Density Contactless Flash Memory Array Using Split-Gate Source-Side-Injection Cell for 5V-Only Applications," Symposium of VLSI Tech. Digest of Tech. Papers, pp. 49-50 (1994). |
Ma., et al., A Novel High Density Contactless Flash Memory Array Using Split Gate Source Side Injection Cell for 5V Only Applications, Symposium of VLSI Tech. Digest of Tech. Papers, pp. 49 50 (1994). * |
Naruke, et al., "A New Flash-Erase Eeprom Cell with a Sidewall Select-Gate on Its Source Side," IEDM Tech. Dig., pp. 603-606 (1989). |
Naruke, et al., A New Flash Erase Eeprom Cell with a Sidewall Select Gate on Its Source Side, IEDM Tech. Dig., pp. 603 606 (1989). * |
Cited By (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6232179B1 (en) * | 1997-06-27 | 2001-05-15 | Matsushita Electronics Corporation | Semiconductor device and method of manufacturing the same |
US6608347B2 (en) | 1997-06-27 | 2003-08-19 | Matsushita Electric Industrial Co., Ltd. | Semiconductor device and method of manufacturing the same |
US6143606A (en) * | 1997-12-26 | 2000-11-07 | Worldwide Semiconductor Manufacturing Corp | Method for manufacturing split-gate flash memory cell |
US6096603A (en) * | 1998-02-16 | 2000-08-01 | Worldwide Semiconductor Manufacturing Corp. | Method of fabricating a split gate structure of a flash memory |
KR100607322B1 (en) * | 1999-06-30 | 2006-07-28 | 주식회사 하이닉스반도체 | Method of manufacturing a flash EEPROM cell |
US6255164B1 (en) * | 1999-08-03 | 2001-07-03 | Worldwide Semiconductor Manufacturing Corp. | EPROM cell structure and a method for forming the EPROM cell structure |
US20030071304A1 (en) * | 1999-08-13 | 2003-04-17 | Ogle Robert B. | Method of forming flash memory having pre-interpoly dielectric treatment layer |
US6716702B2 (en) * | 1999-08-13 | 2004-04-06 | Advanced Micro Devices, Inc. | Method of forming flash memory having pre-interpoly dielectric treatment layer |
US6198144B1 (en) * | 1999-08-18 | 2001-03-06 | Micron Technology, Inc. | Passivation of sidewalls of a word line stack |
JP2001196479A (en) * | 1999-12-27 | 2001-07-19 | Hyundai Electronics Ind Co Ltd | Method for manufacturing flash memory element |
JP4564646B2 (en) * | 1999-12-27 | 2010-10-20 | 株式会社ハイニックスセミコンダクター | Method for manufacturing flash memory device |
US6710395B2 (en) * | 2001-12-19 | 2004-03-23 | Renesas Technology Corp. | Non-volatile semiconductor memory device with improved performance |
US7130182B2 (en) * | 2003-05-27 | 2006-10-31 | Texas Instruments Incorporated | Stacked capacitor and method for fabricating same |
US20070069269A1 (en) * | 2003-05-27 | 2007-03-29 | Scott Balster | Stacked capacitor and method of fabricating same |
US7312119B2 (en) | 2003-05-27 | 2007-12-25 | Texas Instruments Incorporated | Stacked capacitor and method of fabricating same |
US20050045939A1 (en) * | 2003-08-27 | 2005-03-03 | Eungjoon Park | Split-gate memory cell, memory array incorporating same, and method of manufacture thereof |
US7075127B2 (en) | 2004-01-29 | 2006-07-11 | Infineon Technologies Ag | Single-poly 2-transistor based fuse element |
US20050167728A1 (en) * | 2004-01-29 | 2005-08-04 | Chandrasekharan Kothandaraman | Single-poly 2-transistor based fuse element |
US20060141710A1 (en) * | 2004-12-27 | 2006-06-29 | Jae-Man Yoon | NOR-type flash memory device of twin bit cell structure and method of fabricating the same |
US20090191681A1 (en) * | 2004-12-27 | 2009-07-30 | Samsung Electronics Co., Ltd. | Nor-type flash memory device with twin bit cell structure and method of fabricating the same |
US20060252204A1 (en) * | 2005-05-03 | 2006-11-09 | Hynix Semiconductor Inc. | Method of manufacturing a flash memory device |
US7282420B2 (en) * | 2005-05-03 | 2007-10-16 | Hynix Semiconductor Inc. | Method of manufacturing a flash memory device |
US20080067579A1 (en) * | 2006-09-18 | 2008-03-20 | Lee Joo-Hyeon | Flash memory device and method for manufacturing the same |
US7618862B2 (en) * | 2006-09-18 | 2009-11-17 | Dongbu Hitek Co., Ltd. | Flash memory device and method for manufacturing the same |
CN102916013A (en) * | 2011-08-04 | 2013-02-06 | 无锡华润上华半导体有限公司 | OTP (one time programmable) device and manufacturing method thereof |
CN102916013B (en) * | 2011-08-04 | 2016-01-20 | 无锡华润上华半导体有限公司 | OTP parts and manufacture method thereof |
US20130280874A1 (en) * | 2012-04-20 | 2013-10-24 | Ping-Chia Shih | Method of fabricating semiconductor device |
US8722488B2 (en) * | 2012-04-20 | 2014-05-13 | United Microelectronics Corp. | Method of fabricating semiconductor device |
US8895397B1 (en) * | 2013-10-15 | 2014-11-25 | Globalfoundries Singapore Pte. Ltd. | Methods for forming thin film storage memory cells |
US20150372121A1 (en) * | 2014-06-19 | 2015-12-24 | Taiwan Semiconductor Manufacturing Co., Ltd. | Asymmetric formation approach for a floating gate of a split gate flash memory structure |
US9691883B2 (en) * | 2014-06-19 | 2017-06-27 | Taiwan Semiconductor Manufacturing Co., Ltd. | Asymmetric formation approach for a floating gate of a split gate flash memory structure |
US11245026B2 (en) * | 2019-11-22 | 2022-02-08 | Winbond Electronics Corp. | Memory devices |
Also Published As
Publication number | Publication date |
---|---|
TW340958B (en) | 1998-09-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5856223A (en) | Method for manufacturing self-aligned split-gate flash memory cells | |
US6228695B1 (en) | Method to fabricate split-gate with self-aligned source and self-aligned floating gate to control gate | |
US5783457A (en) | Method of making a flash memory cell having an asymmetric source and drain pocket structure | |
US6166410A (en) | MONOS flash memory for multi-level logic and method thereof | |
US5429970A (en) | Method of making flash EEPROM memory cell | |
US7652318B2 (en) | Split-gate memory cells and fabrication methods thereof | |
US6940120B2 (en) | Non-volatile semiconductor memory device and method of fabricating thereof | |
US5427970A (en) | Method of making flash memory with high coupling ratio | |
US5352619A (en) | Method for improving erase characteristics and coupling ratios of buried bit line flash EPROM devices | |
US8884352B2 (en) | Method for manufacturing a memory cell, a method for manufacturing a memory cell arrangement, and a memory cell | |
US5516713A (en) | Method of making high coupling ratio NAND type flash memory | |
EP1091392B1 (en) | A method for forming a contoured floating gate cell | |
US7190021B2 (en) | Non-volatile memory device having improved programming and erasing characteristics and method of fabricating the same | |
US6784039B2 (en) | Method to form self-aligned split gate flash with L-shaped wordline spacers | |
US5830794A (en) | Method of fabricating semiconductor memory | |
US6399466B2 (en) | Method of manufacturing non-volatile semiconductor memory device storing charge in gate insulating layer therein | |
KR100839057B1 (en) | Non-volatile memory cell with non-uniform surface floating gate and control gate | |
US6355527B1 (en) | Method to increase coupling ratio of source to floating gate in split-gate flash | |
EP1345273A1 (en) | Dual bit multi-level ballistic monos memory, and manufacturing method, programming, and operation process for the memory | |
US7741179B2 (en) | Method of manufacturing flash semiconductor device | |
US6130131A (en) | Method for fabricating a flash memory | |
US6864523B2 (en) | Self-aligned source pocket for flash memory cells | |
US8334182B2 (en) | Method for manufacturing non-volatile memory | |
US6638822B2 (en) | Method for forming the self-aligned buried N+ type to diffusion process in ETOX flash cell | |
US6624028B1 (en) | Method of fabricating poly spacer gate structure |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: WINBOND ELECTRONICS CORP., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WANG, LIN-SONG;REEL/FRAME:008572/0216 Effective date: 19970502 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
REMI | Maintenance fee reminder mailed | ||
FPAY | Fee payment |
Year of fee payment: 8 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 12 |